Mid–Senior Proposal Manager, Hybrid-eligible (GT25121613)

GTSC • Chantilly, VA

3d • Hybrid

About The Position

GTSC is a fast-growing federal IT services contractor supporting civilian and DoD customers across IT modernization, cybersecurity, data, systems engineering, and mission support. We are investing deliberately in our growth organization to improve proposal quality, execution rhythm, and win consistency across complex, high-value pursuits. GTSC is seeking a Mid–Senior Proposal Manager to lead large, complex federal proposals in the $35M–$50M range across a mixed civilian and defense portfolio. This role owns proposal execution end-to-end and plays a key role in improving proposal discipline, predictability, and quality as GTSC scales. You will work closely with Capture Managers, technical leaders, partners, and executives to deliver compliant, compelling proposals-while helping standardize and continuously improve GTSC's proposal processes.

Requirements

• Bachelor's degree or equivalent experience
• 5+ years of federal proposal management or closely related experience
• Experience leading large, complex proposals ($35M+)
• Strong understanding of federal RFP structures and compliance
• Ability to manage cross-functional teams under deadline
• Proficiency with Microsoft 365 and collaborative proposal environments
• Comfort using AI/LLM tools to support proposal development

Nice To Haves

• Experience supporting both FedCiv and DoD customers
• Familiarity with Shipley or similar proposal methodologies
• Experience with IDIQs, GWACs, and task-order-based proposals

Responsibilities

• Lead and manage multiple federal proposal efforts from kickoff through submission
• Develop proposal schedules, outlines, compliance matrices, and writing assignments
• Drive proposal cadence, daily standups, and internal reviews
• Ensure full compliance with RFP requirements and evaluation criteria
• Coordinate writers, SMEs, partners, and subcontractors across the proposal lifecycle
• Author or refine proposal sections (e.g., management approach, executive summaries) as needed
• Leverage AI/LLM tools to improve drafting efficiency, content quality, and compliance checks
• Improve proposal rhythm, reduce fire drills, and raise overall submission quality
• Capture lessons learned and contribute to reusable proposal content and standards

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level